Johnson County is located in the U.S. state of Iowa. As of the 2020 census, the population was 152,854, making it the fourth-most populous county in Iowa. The county seat is Iowa City, home of the University of Iowa. Johnson County is included in the Iowa City metropolitan area, which is also included in the Cedar Rapids-Iowa City Corridor Combined Statistical Area.
Johnson County Courthouse
Old Johnson County Courthouse, Iowa City, 1857-1899
Iowa is a landlocked state in the upper Midwestern region of the United States. It borders the Mississippi River to the east and the Missouri River and Big Sioux River to the west; Wisconsin to the northeast, Illinois to the east and southeast, Missouri to the south, Nebraska to the west, South Dakota to the northwest, and Minnesota to the north.
Excavation of the 3,800-year-old Edgewater Park Site
Iowa in 1718 with the modern state area highlighted
Iowa Territorial Seal
Topography of Iowa, with counties and major streams